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Un bomba de doble efecto aspirante e impelente de un solo un cuerpo o cilindro en el cual funciona dos válvulas, una en cada uno de sus dos pistones que en él se hace mover en sentido opuesto.
02115, USA John L. Smith, Transplantation Service, University of Iowa Hospitals and Clinics, Iowa City, Iowa 52242, USA HW Sollinger, Department of Surgery, University of Wisconsin, 600 Highland Avenue, Madison, Wisconsin 53792, USA